{"id":"CVE-2026-63362","aliases":["DEBIAN-CVE-2026-63362","EUVD-2026-51336","GHSA-qv76-j3j3-2f94","UBUNTU-CVE-2026-63362"],"status":"published","title":"o6 Automation open62541 Integer Underflow","description":"An unsigned integer underflow in the PubSub signature verification path \nin open62541 may allow a remote attacker to cause a denial of service \nvia a crafted UDP packet.","severity":{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01822,"percentile":0.79084,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-191"],"published":"2026-07-30T22:01:48Z","modified":"2026-10-28T02:30:57Z","affected":[{"source":"osv","ecosystem":"Debian:13","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1","1.4.18-1"]},{"source":"osv","ecosystem":"Debian:14","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1","1.4.18-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1build1","1.4.18-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1","1.4.11.1-1build1"]}],"products":[{"vendor":"o6 automation","product":"open62541"},{"vendor":"o6 automation gmbh","product":"open62541"}],"references":[{"url":"https://www.o6-automation.com/contact","tags":["web"]},{"url":"https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f","tags":["web"]},{"url":"https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60","tags":["web"]},{"url":"https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e","tags":["web"]},{"url":"https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df","tags":["web"]},{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-08","tags":["advisory"]},{"url":"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63362","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-qv76-j3j3-2f94"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63362.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-63362","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-63362","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63362","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-63362","title":"o6 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